• The area was declared as Protected Forest in the year 1878 
  • It was declared as Reserve Forest in the year 1928 
  • One of the first nine Tiger Reserves declared under the Project Tiger Scheme in the year 1973 
  • A part of the Tiger Reserve was notified as the Sajnakhali Wildlife Sanctuary having an area of 362.33 sq km in the year 1976 
  • The core area of the Tiger Reserve was declared as the Sunderban National Park in the year 1984. 
  • The area of the National Park is 1330.10 sq km The National Park Areas was inscribed as a Natural World heritage Site in the year 1987 
  • The Tiger Reserve along with adjoining forest areas and human habitations were declared as Sunderban Boisphere Reserve in 1989 
  • The Sunderban Biosphere Reserve was recognized as a Global Biosphere Reserve in 2001 1699.62 sq km of the Tiger Reserve was declared as Critical Tiger Habitat in the year 2007